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If y=cos 6x+6cos 4x+15cos 2x+10cos 5x+5cos 3x+10cos x then dydx=

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By Expert Faculty of Sri Chaitanya
a
2sin x+cos x
b
-2sin x
c
cos 2x
d
sin 2x
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detailed solution

Correct option is B

y=(cos 6x+cos 4x)+5(cos 4x+cos 2x)+10(cos 2x+1)cos 5x+5cos 3x+10cos x=2cos 5xcos x+5(2cos 3xcos x)+102cos2 xcos 5x+5cos 3x+10cos x =2cos x
dydx=-2sin x


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